Clean, wash and drain the radish and spring onion. Cut the spring onion into fine rings. Clean field and frisée lettuce, wash thoroughly several times and also drain. Pluck into bite-sized pieces. Wash the herbs, dab dry and pick the leaves from the stems. Wash the flowers and let them drain as well.
Roll up the matie filets and pin them with wooden skewers. Mix the salad ingredients and arrange on 4 plates with the herring rolls. Peel ginger and garlic and chop finely. Mix vinegar, soy sauce, fish sauce, mustard, sugar, some salt, ginger and garlic. Finally add olive and sesame oil. Drizzle the sauce over the salad and fish and serve garnished with the flowers